盾构隧道下穿河流段地震响应数值分析  

Numerical analysis of seismic response of shield tunnel under river section

作　　者：周强 张继清 齐春雨 郭景琢 马庆伟 ZHOU Qiang;ZHANG Jiqing;QI Chunyu;GUO Jingzhuo;MA Qingwei(China Construction Infrastructure Co.,Ltd,Beijing 100044,China;China Railway Design Group Co.,Ltd.,Tianjin 300308,China;National Engineering Laboratory for Digital Construction and Evaluation Technology of Urban Rail Transit,Tianjin 300308,China)

机构地区：[1]中国建设基础设施有限公司,北京100089 [2]中国铁路设计集团有限公司,天津300308 [3]城市轨道交通数字化建设与测评技术国家工程实验室,天津300308

出　　处：《世界地震工程》2023年第4期40-45,共6页World Earthquake Engineering

基　　金：中建基础科技研发课题(CSCIC-2020-KT-(01));中建股份科技研发计划资助(CSCEC-2021-Z-(25))。

摘　　要：下穿河流段盾构隧道在地震作用下极易发生损坏。本文依托天津地铁某下穿河流段盾构隧道实际工况,采用有限差分软件Flac3D进行数值模拟,分别对该段隧道在地震作用下的应力反应规律,相对水平位移反应规律以及加速度反应规律进行分析。结果表明:下穿海河段盾构隧道的最大主应力分布出现在河岸坡底部隧道管片上,最大拉应力出现在左拱肩的位置,而最大压应力分布在右拱肩以及左拱腰部;地震作用下,盾构隧道的拱肩以及拱腰应力分布较大,同时,河岸底部盾构隧道截面有开裂的危险。在El-Centro波作用下,隧道相对位移最大值出现在拱顶位置。Shield tunnel under river section is easily damaged by earthquake.In this paper,based on the actual working conditions of a tunnel under a river section of Tianjin metro,the finite difference software Flac3d is used for numerical simulation.The stress response law,relative horizontal displacement response law and acceleration response law of this section of tunnel under earthquake action are analyzed respectively.The results show that the maximum principal stress distribution of shield tunnel is in the tunnel segment at the bottom of river slope,the maximum tensile stress is in the position of the left arch shoulder,and the maximum compressive stress is in the right arch shoulder and the left arch waist.The stress distribution of shoulder and waist of shield tunnel is large under earthquake action,and the section of shield tunnel at the bottom of bank is in danger of cracking.Under the action of El-Centro wave,the maximum relative displacement of the tunnel appears at the position of the vault.

关 键 词：盾构隧道 动力响应 有限差分 位移时程 

分 类 号：TU398.9[建筑科学—结构工程]